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1 Department of Radiology, Veterans Administration Medical Center, 3350 La Jolla
Village Dr., San Diego, CA 92161.
2 Present address: Department of Radiology, Trillium Health Centre,100 Queensway
W., Mississauga, Ontario, L5B 1B8 Canada.
3 Present address: Institute of Anatomy, University of Vienna, Waehringerstr.
13, A-1090 Vienna, Austria.
4 Department of Radiology, Rush-Copley Medical Center, 2000 Ogden Ave., Aurora,
IL 60504.
OBJECTIVE. We sought to evaluate the anatomy of the posterolateral aspect of the knee with anatomic dissection, MR imaging, MR arthrography, and sectional anatomy.
MATERIALS AND METHODS. We assessed the posterolateral corner of the knee during dissection of one gross anatomic specimen. MR imaging and MR arthrography were performed in seven additional knee specimens. T1-weighted spin-echo MR images were obtained in the standard imaging planes as well as in the coronal oblique plane. The specimens underwent T1-weighted spin-echo MR imaging after administration of intraarticular contrast material and were sectioned into planes corresponding to those of the MR images.
RESULTS. At anatomic dissection, the following posterolateral structures were identified: the arcuate ligament (medial and lateral limbs), fabellofibular ligament, popliteofibular ligament, popliteus tendon and its two posterior attachments to the lateral meniscus, fibular collateral ligament, direct and anterior arms of the tendon of the long head of the biceps femoris muscle, and direct and anterior arms of the tendon of the short head of the biceps femoris muscle. Correlation of MR imaging and anatomic findings showed that the popliteofibular ligament and oblique popliteal ligament were found in 57% and 100% of specimens, respectively. At least one of the two limbs of the arcuate ligament was identified in 71% of specimens. The fabellofibular ligament was not identified on MR images in any of the specimens. The anteroinferior and posterosuperior popliteomeniscal fascicles were identified in all specimens.
CONCLUSION. The posterolateral corner of the knee comprises complex and variable anatomic structures. Recognition of these variations is important in the assessment of MR images of the knee.
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